exam Maths Puzzle Numerical Ability

Add 10c-1 and 4c-1

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exam Other Question

I cannot figure out how to solve this logarithm equation

log(8x)=7.9+log(1.25)

Please help.

xandra
Graph the equations
a=y=-7
b=x=-5
Show how you got the answer. Any and all assistance in this matter is greatly appreciated in advance.